I think you'll find that top of the range cars (avec new technology) are not cheaper than the same top of the range say, 10 years ago
I think a mid-price mass market car would be a better comparison. Say a Ford Anglia vs a Ford Escort verus a current Ford Focus. https://www.motoringresearch.com/car-news/cost-car-year-born
has quite a lot of data and it seems that inflation-adjusted prices for cars have been pretty static since 1950. Although in 2017 you get MUCH more for your money (power, space, and technology) and of course we are much richer than in 1950 so as a proportion of average income cars are now much cheaper.